Electrical system



Sept. 4, 1928. 1,683,090

C. B. MIRICK ELECTRICAL SYSTEM Filed July 10, 1925 Carlo-s B. Mir i072 Patented Sept. 4, 1928.

UNITED STATES PATENT OFFICE CARLOS B. MIRICK, OF WASHINGTON, DISTRICT OF COLUMBIA. ELECTRICAL SYSTEM.

Application filed July 10, 1925. Serial N0. 42,777.

My invention relates generally to elect systems, espcciall switches or circuit 010 butmore particu rical sers,

arly to a switch not requiring a physical contact between its elements.

An object of my invention is to provi means for closing an a frictionless switch.

Another object of my invention is to vide a friction-less switch for alternating dea electric circuit through pro-- curtubes T T T and T, is generated by vacuum tube T, associated with inductance 5, condensers 6 and 7, a device well known in the art. Battery 8 heats the filament of all the vacuum tubes and batter 14 furnishes the plate potential for all oft e tubes. Battery 9 and associated resistances 10, 11, 12 and 13 control the grid biasing of the tubes T T T and T the grid bias being preferably subrents, more particularly high frequency curstantially negative to hold the plate currents 6 rents. pf the tube to low values when not in operaapion.

Further obfects of my invention will pear more ful y hereinafter.

My invention consists substantially in the construction, combination,

location and rela tive arrangement of parts and circuit arrangements associated therewith, all as will be more fully hereinafter set forth as shown by the accompanying drawings and finally pointed out in the appended claims.

Reference is to drawing forming in which is shown invention and in which:

be had to the accompanying a part of this specification a fixed embodiment of my N represents the arm or lever of an electric switch, supported in position on the spindle S. On N is mounted a metal plate V, of size and shape as to form one capacity of an electrical condenser,

such

area

the other capacity area of the condenser being a similar plate or a selected one of several similar plates four are shown in the drawing) secured in such position that as the switch arm N is moved to its various positions the close arallel relation to t e plates a, b, 0, there y forming an electrical condenser one of these plates. scribed is the only apparatus required in the switch is to be used to pass small high quency or alternating currents.

If it is desired to control direct curr or large high frequency or alternatin rents, an auxiliary and preferabl high quency alternating current is use as a enser in a direct current circuit pletely block the flow of that current, or struction difiiculties will be late V comes into a or d, with The device so far decase freents, curfreconwill comencountered where large high frequency or large alternating currents are to be controlled. When COII- The operation of this device is as follows:

Switch arm N is moved by any means to the position shown. The arm be the needle of a magnetic cillatlng current enerated by tube T is transferred across t e condenser formed by V and a and flows to the grid of T The resulting change in the plate current of T causes relay 1 to operate, closing or opening contact a according to the circuit connections of that contact. Similarly relays 2, 3 and 4 are controlled by plates b, c, and d and vacuum tubes T T and. respectively.

It may be noted that two capacities in series enter 1nto the operation of the system shown. Qne is the capacity at the oint of the frictlonless circuit closer, and tlie other is the capacity between the grid and filament of. the tubes T,'T T and T In order that the change of the circuit closer capacity may predominate in the circuit it must always be smaller than the grid filament capacity of the tubes As the reactances due to these two capac ties vary inversely with the frequency the dance will be independent, in this respect, of the frequency changes of the auxiliary osc llating currents generated in T and assoelated circuits.

$hou ld it be desirable to immerse the switch in a liquid to dam en the action of the arm or lever, oil would be suitable for electrical work. If so immersed the size of the plates may be decreased or the spacing between the plates V and a may be increased to compensate for the higher dielectric constant of the oil.

It will be understood that the above discurrent for influencing the grids of vacuum trolling with the aid of an auxiliary hi h frequency current fixed plates a, b, c, an d are connected to the grids of four vacuum tubes T T T and T,,, which tubes control the plate circuit relays 1, 2, 3, and 4. Auxiliary closure and the accompanying drawing comprehend only a single embodiment of my invention and that various changes in construction, roportion and arrangement of parts may e made within the'scope of the disclosure and appended claims without sacrificing any of the advantages of my invention. Having described my invention what I claim is:

1. In an electrical indicator system, the combination of a slurality of vacuum tube relays having gri -filament and plate-filament circuits, a plurality of electro-magnetic relays, the coil of each one of which 1s disposed in the plate-filament circuit of its corresponding vacuum tube, a vacuum tube scillator and means for couplin the vacuum tube oscillator to each grid of the vacuum tube relays independently of the other relays.

2. In an electrical indicator system, the com- 7 bination of a lurality of vacuum tube relays having gridlament and plate-filament circuits, a plurality of electro-magnetic relays the coil of each one of which is disposed in the. plate-filament circuit of its corresponding vacuum tube, a vacuum tube oscillator and means for cou lin the vacuum tube oscillator to each gri of t e vacuum tube relays independently of the other relays, said means consisting of a capacity switch.

3. In an electrical indicator system, the combination of a lurality of vacuum tube relays having gri -filament and plate-filament circuits, a plurality of electro-magnetic relays, the coil of each one of which is disposed in the plate-filament c1rcu1t of its corresponding vacuum tube, a vacuum tube oscillator, a capacity switch for coupling the vacuum tube oscillator to the individual grids of the vacuum tube relays, said switch consistin of a plurality of arcuate plates arranged a out a center, and a movable plate pivoted upon the center to move in close proximity to each of the arcuate plates, said movable plate being electrically connected to the vacuum tube oscillator, and each of said arcuate plates electrically connected to the id of its corresponding vacuum tube.

4. In an electrical indicator system, the combination of a plurality of vacuum tube relays having grid-filament and plate-filament circuits, a plurality of electro-magnetic relays, the coil of each one of which is disposed in the plate-filament circuit of its corresponding vacuum tube, a vacuum tube oscillator, means for cou ling the vacuum tube oscillator to each gri of the vacuum tube relays independently of the other relays and means for maintaining a negative grid bias upon the grids of the remainmg vacuum tube relays.

5. In an electrical indicator system, the combination of a plurality of vacuum tube relays having gri -filament and plate-filament circuits, a plurality of electro-ma etic relays, the coil of each one of which dis posed in the plate-filament circuit of its corresponding vacuum tube, a vacuum tube oscillator, means for cou ling the vacuum tube oscillator to each gri of the vacuum tube relays independently of the other relays, means consisting of a capacity switch, and means for maintaining a ne ative grid bias upon the grids of the remainmg vacuum relays.

6. In an electrical indicator system, the combination of a plurality of vacuum tube relays having grid-filament and plate-filament circuits, a plurality of electro-magnetic relays, the coil of each one of which 1s disposed in the plate-filament circuit of its corresponding vacuum tube, a vacuum tube oscillator, a capacity switch for cou ling the vacuum tube oscillator to the individ ual grids of the vacuum tube amplifiers, said switch consistin of a plurality of arcuate plates arranged a ut a center, a movable plate pivoted upon the center to move in close proximity to each of the arcuate plates, said movable plate being electrically connected to the vacuum tube oscillator and each of said arcuate plates electrically connected to the grid of its corresponding vacuum tube, and means for maintaining a negative grid bias upon the grids of the remainlngzvacuum tube relays.

CA LOS B. MIRICK.

said

tube 

